CS144 (5.7L "P" Series)
- Scribe end frames to facilitate reassembly. Remove through-bolts and separate end frames.
- Using ohmmeter, measure coil resistance between slip rings. See Fig 1. On "P" series, coil resistance should be 2.1-2.4 ohms at 80°F (27°C). On all models, if coil resistance is not as specified, replace rotor.
- Using ohmmeter, check for grounds between either slip ring and rotor pole piece. See Fig 1. Ohmmeter should indicate infinite resistance. If reading is not infinity, replace rotor.
- Resistance readings will vary slightly with winding temperature changes. If generator does not supply rated output and rotor is okay, rectifier bridge, stator or regulator is faulty.
- To reassemble generator, reverse disassembly procedure. Retain brushes with brush retaining pin during reassembly. See Fig 2. Remove retaining pin after tightening through-bolts.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.